Tool for mounting and dismounting a bolted union

ABSTRACT

A tool for mounting and dismounting a bolted union comprising a nut and a bolt consists of a spanner which serves to screw the nut onto the bolt and unscrew it therefrom, and of a pin of unround cross section mounted for rotation in the spanner and adapted to engage in a central bore of conforming cross section formed in the free bolt end which cooperates with the nut. The pin mounted for rotation in the spanner and having unround cross section is longitudinally movable within broad limits in the spanner and the pin which has a handle for permitting rotation thereof in relation to the spanner cooperates with a spring mechanism which tends to urge the pin downwards to the position to be occupied by the nut in the spanner. A bolt which is for use in the bolted union and adapted to be operated by the tool has a central hexagon bore formed in its free end.

United States Patent 1191 Naslund 5] Feb. 5, 1974 TOOL FOR MOUNTING ANDDISMOUNTING A BOLTED UNION Primary ExaminerJames L. Jones, Jr AssistantExaminer-Roscoe V. Parker Attorney, Agent, or Firm-Karl W. Flocks [76]Inventor: Bengt Roland Naslund, Snappvagen l6,1906OBlt,S d a s a we en[57 ABSTRACT [22] Filed: 35 1972 A tool for mounting and dismounting abolted union [21] Appl. N0.: 237,624 comprising a nut and a boltconsists of a spanner which serves to screw the nut onto the bolt andun- I v screw it therefrom, and of a pin of unround cross sec- [30]Forelgn Apphcanon pnonty'Data tion mounted for rotation-in the spannerand adapted Marv 29, 1971 Sweden 4017/71 to engage in a central bore ofconforming cross ec- 7 tion formed in the free bolt end which cooperateswith U-S. Cl. the nut 'The mounted for rotation in the panner [5 andhaving unround cross section is longitudinally Fleld of Search 81/13, 3F, 55; 29/240 movable within broad limits in the spanner and the pinwhich has a handle'for permitting rotation thereof in References Cltedrelation to the spanner cooperates with a spring mech- UNITED STATESPATENTS anismwhich tends to urge the pin downwards to the 3,394,6237/1968 Kinakin 7. 81/55 Position be Occupied by the nut in the Spanner-2,007,432 7/1935 Mancuso 81/3 F A bolt is for use in the bolted unionand FoREiGN PATENTS OR APPLICATIONS adapted to be operated by the toolhas a central 1,020,940 11/1952 France .[81/3-F hexagm bore formed mfree 3 Claims, 5 Drawing Figures Patented Feb. 5, 1974 2 Sheets-Sheet 1.

2 Sheets-Shoot 2 ginning of an operation TOOL FOR MOUNTING ANDDISMOUNTING A BOLTED UNION This invention relates to, a tool formounting and dismounting a bolted union comprising a nut and a bolt,said tool consisting of a spanner serving to screw the nut onto the boltand to unscrew it therefrom, and of a pin of unround cross sectionmounted for rotation in the spanner and adapted to engage in a centralbore of conforming cross section formed in the free bolt end whichcooperates with the nut. According to the invention, the pin of unroundcross section which is mounted for rotation in the spanner islongitudinally movable within broad limits in said spanner andcooperates with a spring mechanism which tends to urge the pin downwardsto the position to be occupied by the nut in said spanner, and the pinhas a handwheel for its rotation in relation to the spanner. On accountof its movability the pin during the entire mounting and dismountingoperation is sure to take part in the movement of the bolt in relationto the nut with the pin end snugly engaged in the unround central boreof the bolt. The spring mechanism cooperating with the pin ensures areliable engagement between the pin end and the unround central bore ofthe bolt, and simultaneously said mechanism tends to urge the nut of thebolted union into engagement with the united parts. The handwheel of thepin is an extremely simple operating means ensuring a simple andreliable use of the tool.

The invention is also concerned with a bolt for coaction with the toolwhen the pin having the unround cross section is a hexagon box spanner.According to the invention, said bolt is formed in its free end with acentral hexagon bore in which the hexagon box spanner is to engage withits pin at the mounting and dismounting of the bolted union. Withinbroad limits for' the size of the bolt said hexagon bore shall have thesame dimension to permitusing the same hexagon box spanner in a greatmany different connections.

The invention will now be more fully described hereinbelow withreference to the accompanying drawings which illustrate an embodiment ofthe tool chosen by way of example, and a bolt with pertaining nut forsaid tool.

n In the drawings: I

FIGS. 1 and 2 are side views of the constituent parts of'the tool;

FIG. 3 is a sideview of the bolt and the nut;

FIG. 4 is a longitudinal section of the tool at the be for mounting abolted union; and

FIG. 5 is a longitudinal section of the same parts but at the end of theoperation for mounting the bolted un- As will appear from the drawingsthe tool consists of a spanner 2 having a handle 1 for screwing the nut3 onto and unscrewing it from the bolt 4, and of a pin 5 of unroundsection mounted for rotation in the spanner and adapted to engage in acentral bore 6 formed in the free end of the bolt 4 remote from the headthereof.

The central bore 6 is ofa section conforming to that of the pin. Thespanner 2 more particularly comprises a hexagon box conformed to the nut3 and having a square hole 7 for accommodating an arm 8 extending atright angles from and integral with the handle 1, said arm having thesame cross section as saiclv hole 7. The arm 8 is formed with a centralbore 9 for the pin 5 of the hexagon box spanner, said pin 5 beingmounted for rotation in said bore 9.

According to the invention, the pin 5 of the hexagon box spanner islongitudinally movable within broad limits in the hexagon box 2, as willappear from a comparison between FIGS. 4 and 5. The pin 5 can thus takepart in the entire axial movement of the bolt 4 at the mounting. The pin5 co-acts with a spring mechanism 10 which tends to urge the pindownwards to the position to be occupied by the nut 3 in the hexagon box2. The spring mechanism 10 is a coil spring which is wound about the pin5 and has its one end in bearing engagement with an abutment 11 in thecentral bore 9, while the other end thereof is in bearing engagementwith an abutment 12 formed on the pin 5. Said abutment 12 is arranged ata distance from the end of the pin 5 which is substantially equallylarge as the hexagon bore 6 in the bolt 4 is deep so that in themounting operation the pin 5 can always reach the bottom in the bore 6.The pin 5 has a handwheel 13 attached thereto for permitting rotation ofthe pin 5 relative to the hexagon box 2. Either the hexagon box 2 isrotated by means of the handle 1. while the pin 5 is maintainedstationary with the handwheel 13, or the pin 5 is rotated by means ofthe handwheel 13 while the hexagon box 2 is maintained stationary bymeans of the handle 1.

As will appear from the drawing the pin 5 is of such a length asto'reach with its free end 14 all the way into the hexagon bore 6 of thebolt 4 when the nut 3 is screwed onto the bolt by less than one turn.The pin 5 can then take part in the axial movement of the bolt 4 to aposition in which the abutment l2 bears against the end of the arm 8.

When the bolted union is mounted the bolt 4 is passed with its free endthrough the part or parts 15, whereupon the nut 3 is manually screwedonto the bolt by approximately one turn. The tool is then caused toengage the bolted union, the hexagon box 2 grasping the nut 3 engagingthe part 15 while the pin 5 of the hexagon box spanner is caused toengage in the hexagon bore 6 formed in the bolt 4. The operator with hisone hand retains the hexagon box 2 by-means of the handle I while herotates the pin 5 with his other hand which grasps the handwheel 13.This rotation is completed to the final position illustrated in FIG. 5in-which the final tightening is brought about with the aid of thehandle 1 which actuates the nut 3 over the hexagon box 2.

By rotating the bolt 4 by means of the pin 5 between the positions shownin FIGS. 4 and 5 the threads formed on the bolt 4 are not subjected toany upsetting action from the parts 15, as would have been the case ifthe bolt 4 had been passed through the parts 15 without being rotated. i

16 designates a ball and socket joint on the handle 1, by which thehandle can be adjusted into various angular positons.

I claim:

1. A tool for mounting and dismounting a bolted union comprising a nut(3) and a bolt (4). said tool consisting ofa hexagon box spanner (2)with a handle and an open lower end for reception of said nut and an endof said bolt to screw the nut (3) onto the bolt (4) and to unscrew ittherefrom, and a pin (5) of continuous unround cross-section mounted forrotation in the spanner (2) and adapted to engage in a central bore (6)of conforming cross-section formed in the free end. of

the bolt (4) which cooperates with the nut (3), 'said pin (5) beingprovided with an operating means (13) for rotating the pin relative tothe spanner, wherein the pin (5) of unround cross-section which ismounted for rotation in the spanner (2) is movable so far in itslongitudinal direction of the spanner (2) through a horizontal planedefining said open lower end of said spanner so that the pin (5) canfollow the bolt (4) during the entire movement thereof in relation tothe nut (3) when said nut is screwed onto the bolt and unscrewedtherefrom, and the pin (5) cooperates with a spring mechanism whichtends to urge the pin downwards to the poround cross section is part ofa hexagon box spanner. V

3. A bolt for use in a bolted union and adapted to be operated by thetool defined in claim 2, said bolt having a shallow central hexagonbore, in which said pin may be continuously seated during operation ofsaid tool,

formed in its free end.

1. A tool for mounting and dismounting a bolted union comprising a nut(3) and a bolt (4), said tool consisting of a hexagon box spanner (2)with a handle and an open lower end for reception of said nut and an endof said bolt to screw the nut (3) onto the bolt (4) and to unscrew ittherefrom, and a pin (5) of continuous unround cross-section mounted forrotation in the spanner (2) and adapted to engage in a central bore (6)of conforming crosssection formed in the free end of the bolt (4) whichcooperates with the nut (3), said pin (5) Being provided with anoperating means (13) for rotating the pin relative to the spanner,wherein the pin (5) of unround cross-section which is mounted forrotation in the spanner (2) is movable so far in its longitudinaldirection of the spanner (2) through a horizontal plane defining saidopen lower end of said spanner so that the pin (5) can follow the bolt(4) during the entire movement thereof in relation to the nut (3) whensaid nut is screwed onto the bolt and unscrewed therefrom, and the pin(5) cooperates with a spring mechanism (10) which tends to urge the pindownwards to the position occupied by the nut (3) in the spanner (2),said pin (5) in the lowermost position reaching the open end of thespanner (2).
 2. A tool as claimed in claim 1, wherein the pin of unroundcross section is part of a hexagon box spanner.
 3. A bolt for use in abolted union and adapted to be operated by the tool defined in claim 2,said bolt having a shallow central hexagon bore, in which said pin maybe continuously seated during operation of said tool, formed in its freeend.